Hello I got the new 2019 Corolla (1.8 TS) and it came with the following tires/rims written on the technical document: 225/45R17 91W; 17x7 1/2J ET40 C1 C The car also came with a free set of winter tires of the same size, for which I would like to buy another set of rims so that i don't have to remove the tires every winter. The original ones from the dealer are very expensive so I'd like to buy something aftermarket. I have the following things unclear: - what is 1/2J (